Understanding this Circuit involving Relays

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Discussion Overview

The discussion revolves around understanding a specific circuit involving relays controlled by a microcontroller. Participants are exploring the purpose of the circuit, its application in phase voltage measurement, and the calculations related to voltage at the microcontroller input.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant seeks to understand the circuit's purpose, suggesting it may be used to switch between star and delta connections.
  • Another participant discusses the circuit's role in measuring phase voltage and proposes a calculation for the Y phase voltage at the microcontroller input.
  • A third participant challenges the arithmetic of the proposed voltage calculation, indicating a potential error in the use of the k multiplier.
  • There is a request for a more readable schematic to aid in understanding the circuit.

Areas of Agreement / Disagreement

Participants express uncertainty about the circuit's purpose and the accuracy of the voltage calculations. There is no consensus on the correct interpretation or application of the circuit.

Contextual Notes

The discussion lacks detailed information about the circuit schematic and the specific roles of the components involved, which may affect the understanding of the circuit's function.

PhysicsTest
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TL;DR
I need to understand the hardware circuit.
I need to understand the below circuit, the RB4, RB5, RB6, RB7 are controlled by the micro controller. The COM2 and COM3 are going as input to the micro. I know when the outputs RB4 to RB7 are ON, the relays will be ON and 3,4 get shorted. But i don't understand the purpose the circuit. Am i sorry that i don't have much details. Any comments can help me, I heard it can be used to change star to delta connection and vice versa. HardwareDiagram.jpg
 
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Just to add this is the circuit used for phase voltage, i need to understand. Can I assume that the calculations for Y phase voltage at the micro input is 560K and 560K in series and 10K in parallel
Hence for 100V for example
Voltage at micro = (100*10)/(560K + 560K + 10K) = 0.97V. Please advise, i am not going to design this circuit, this is only for understanding purpose.
 

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PhysicsTest said:
Voltage at micro = (100*10)/(560K + 560K + 10K) = 0.97V.
Check your arithmetic and the missing k multiplier ?
100V *( 10k / ( 10k + 560k + 560k ) ) = 0.885 V
 
PhysicsTest said:
But i don't understand the purpose the circuit. Am i sorry that i don't have much details.
The text is important. There is too much white space. Do you have a readable schematic ?
 

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